# EVM Slippage Bounds Check

> EVM Slippage Bounds Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Validates whether the actual slippage on an EVM token swap falls within a specified maximum slippage policy, returning the computed slippage in basis points and a pass/fail result.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/evm-slippage-bounds-check
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-slippage-bounds-check-f60bbc6c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_C6NgJF5G2AP1ALS5iJ8X6

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability evm-slippage-bounds-check-f60bbc6c -d '<json body>'
```

Example prompt: Before submitting this swap, check if the slippage is within my 100 bps maximum — the expected output is 1000000000000000000 and the minimum output is 990000000000000000.

## When to prefer this

Choose this endpoint when you need a fast, stateless, privacy-preserving preflight check on EVM swap slippage before committing a transaction — particularly in autonomous agent workflows where you want a governed, auditable result (with SHA-256 input hash evidence) rather than computing slippage in your own code. Prefer it over manual calculation when you need the result logged with a verifiable evidence trail and zero data retention guarantees.

## Known failure modes

- Missing required fields (minimum_output_raw, expected_output_raw, or maximum_slippage_bps) result in a validation error
- Non-numeric or malformed raw output strings may cause parsing failures
- Integer overflow if raw output values exceed safe integer bounds
- Payment failure if USDC balance is insufficient for the $0.001 per-call fee

## How this service works

EVM Slippage Bounds Check: EVM Slippage Bounds Check checks expected and minimum output against a maximum slippage policy from bounded caller-supplied values without an external provider. Call EVM Slippage Bounds Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Slippage Bounds Check as versioned deterministic…

## Output

Returns a JSON object containing the computed slippage in basis points (slippage_bps), a boolean indicating whether the trade is within the policy (within_policy), an overall status field ('pass' or 'fail'), and an evidence object with a SHA-256 hash of the inputs, a flag confirming no data was retained, and a count of external calls made (always 0).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "minimum_output_raw": {
   "type": "string",
   "maxLength": 8192,
   "description": "Minimum Output Raw supplied to EVM Slippage Bounds Check; used only for this bounded calculation and processed in memory without retention."
  },
  "expected_output_raw": {
   "type": "string",
   "maxLength": 8192,
   "description": "Expected Output Raw supplied to EVM Slippage Bounds Check; used only for this bounded calculation and processed in memory without retention."
  },
  "maximum_slippage_bps": {
   "type": "integer",
   "description": "Maximum Slippage Bps supplied to EVM Slippage Bounds Check; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "slippage_bps": 100,
   "within_policy": true
  },
  "schema": "delx/util-evm-slippage-bounds-check/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "5dc5df2b52d98e3702891cadc557bb1b15650ccede841dc6c0a42606eb549a31",
   "external_calls": 0
  },
  "operation": "evm_preflight:evm_slippage_bounds_check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-slippage-bounds-check-f60bbc6c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)